Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011
OPERATING ACTIVITIES:
Net income	$ 65,491	$ 71,786
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	19,029	19,030
Amortization of intangibles	4,457	4,780
Impairment of assets held for sale	549	2,320
Stock-based compensation	5,574	4,501
Non-cash inventory charge	567	3,678
Excess tax benefit on share-based compensation	(2,471)	(3,873)
Loss (gain) on disposal of fixed assets	62	(258)
Changes in operating assets and liabilities:
Accounts receivable	(12,756)	(12,266)
Inventories	58	(4,370)
Prepaid expenses and other	(748)	(1,504)
Accounts payable	5,640	1,023
Accrued expenses (including post-retirement)	(5,234)	(28)
Accrued payroll and severance	(4,646)	(4,918)
Accrued taxes	479	4,052
Net cash provided by operating activities	76,051	83,953
INVESTING ACTIVITIES:
Purchases of property, plant, and equipment	(12,797)	(12,381)
Business acquisition settlement		50
Business acquisitions, net of cash acquired	(34,016)	(11,127)
Purchase of investment	(10,000)	(3,000)
Purchase of short-term investments	(4,616)
Proceeds from sales of short-term investments	17,805
Proceeds from sale of assets	495	574
Net cash used in investing activities	(43,129)	(25,884)
FINANCING ACTIVITIES:
Proceeds from debt	20,251	110,000
Payments of term debt		(49,000)
Payments of revolving credit facility	(17,500)	(42,000)
Purchases of common stock		(37,091)
Debt issuance costs		(716)
Cash dividends paid	(12,181)	(10,633)
Proceeds from exercise of stock options	13,411	21,738
Excess tax benefit on share-based compensation	2,471	3,873
Net cash provided by (used in) financing activities	6,452	(3,829)
Effect of exchange rate changes on cash and cash equivalents	4,008	(536)
Increase in cash and cash equivalents	43,382	53,704
Cash and cash equivalents at beginning of period	164,016	109,720
Cash and cash equivalents at end of period	$ 207,398	$ 163,424